I just realized others have already mentioned something like this, but nonetheless, I hope the info will help some :D
May I ask what the side story is about? Even just based on the pictures, since you mentioned you can’t read it.
Sure! SPOILERS:
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So the one that comes with the regular edition and the amazon one is pretty much: Akihito and Asami are in the jungle, they come across some magic mushrooms and the mushrooms explode when Akihito touched them. They then go into a dream world and it starts with them driving in a convertible (Asami driving of course!) and then they go to the beach and I'm guessing its like a date cuz they end up at a hotel where there is a teddy bear on the bed with a necklace that has a ring on it! And so Asami proposes to Akihito and of course he says yes! I believe they do their naughty business. Then they are wearing suits and theres a wedding bell and they start dancing. In the middle of the dance it starts to rain and they are brought back into reality and I think (not sure) are kind of embarrassed and surprised by what happened and thats it.
FYI, the booklet that came with the Finder Vol. 10- Animate Edition also comes with a reprint of this Finder crossover special that YA did exclusively for the Animate Store in Ikebukuro: http://www.mangago.zone/read-manga/you_re_my_loveprize_in_viewfinder/mh/v09/c055.1/
I'm sure the translators/groups working on this know, but Volume 10 just came out 2 days ago and animate (anime store in Japan that sells goods/comics) came out with their limited edition only copy. It comes with a booklet that has commentary on some of the pages from the vol. 10 comic (they look really interesting and kinda cute). Since this is something that cannot be licensed (I already asked SubLime, because it is an animate exclusive bonus book) I hope scanlators will be up for uploading it XD I bought the book but can't read it! So お願いいたします。
Also, for those interested, Amazon.co.jp has their own version of volume 10 (the only difference is the cover) and the booklet that comes with it has a really cute side story. The Amazon and regular version are the same books, with only a cover difference (the bonus book that comes with them are also the same). Being a collector of this series I can tell you how much of a hassle it has been getting the previous limited version, so if you are interested in the bonus books I'd suggest getting them as they go away once stock is sold out.
If anyone has questions please let me know.... Sorry if some people already know about the different editions, but I take it there are others who dont so this message is for them XD